I'm with loststar, nicely trimmed and it's a pleasure not a chore! Shaved down below is not v nice though-horrible stubble growing back would look hideous.
Hmmm, I think a guy shaving it all off shows insecurity, as he probably just wants his to look bigger. I dont shave mine, but trim it a little. I never know when i might get lucky...
The current trend in American adult movies - from where a number of social fads eminate - is for men to remove all bodily hair, legs, arms, chest, bits, the lot. It probably looks OK if you are really ripped, but I wouldn;t go for it personally, it implies an unhealthy self-obsession.
If I was young free and single, I may have a trim, but not an 'all-off' - I have no insecurities about 'boosting; things!